WaE: C6011 Dereferencing NULL pointer warnings

Change-Id: I5a4d2982b5d980704dfc19fd92d01fd8aeefe144
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/166952
Reviewed-by: Caolán McNamara <caolan.mcnamara@collabora.com>
Tested-by: Jenkins

external/dtoa/C6011.patch.0

@@ -0,0 +1,10 @@
+--- src/dtoa.c	2024-05-01 10:10:49.702762020 +0100
++++ src/dtoa.c	2024-05-01 10:11:45.308831303 +0100
+@@ -1606,6 +1606,7 @@
+ 		else
+ 			rv = (Bigint*)MALLOC(len*sizeof(double));
+ #endif
++		assert(rv && "Don't handle OOM conditions");
+ 		rv->k = k;
+ 		rv->maxwds = x;
+ 		}

external/dtoa/UnpackedTarball_dtoa.mk

@@ -17,6 +17,7 @@ $(eval $(call gb_UnpackedTarball_add_patches,dtoa, \
     external/dtoa/include_header.patch \
     external/dtoa/coverity.patch \
     external/dtoa/ubsan.patch.0 \
+    external/dtoa/C6011.patch.0 \
 ))
 
 # vim: set noet sw=4 ts=4: